Humminbird 300 SERIES 345C DI - Manual (Page 22)

What’s on the Down Imaging™ Display
Down Imaging™ uses its unique transducer and sonar technology to provide
definition profiling beams produce the detailed sonar data that you see on the
can interpret the structure and bottom contour, including the following items:
What’s on the Down Imaging™ Display
Depth - (water depth) can be set to alarm when
the water becomes too shallow.
Temperature - Water surface temperature.
Speed - If a Temp/Speed accessory is connected,
the Fishfinder can display the speed of the boat
and can keep a Triplog of nautical or statute
miles traveled.
Topography Changes - The light part of the
display shows where the beam is hitting hard
bottom or rising terrain. The dark part of the
display indicates soft bottom (sand, mud) or
descending terrain.
Bottom Return - Use the appearance of the bottom
return to determine bottom hardness. Rock and
gravel provide a clearer sonar return than mud
and sand because hard objects reflect sonar
better than soft objects.
NOTE: Entries in this view that list (with Temp/Speed) are available if the accessory is
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